LXR linux/arch/s390/include/asm/airq.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *    Copyright IBM Corp. 2002, 2007
   4 *    Author(s): Ingo Adlung <adlung@de.ibm.com>
   5 *               Cornelia Huck <cornelia.huck@de.ibm.com>
   6 *               Arnd Bergmann <arndb@de.ibm.com>
   7 *               Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   8 */
   9
  10#ifndef _ASM_S390_AIRQ_H
  11#define _ASM_S390_AIRQ_H
  12
  13#include <linux/bit_spinlock.h>
  14
  15struct airq_struct {
  16        struct hlist_node list;         /* Handler queueing. */
  17        void (*handler)(struct airq_struct *);  /* Thin-interrupt handler */
  18        u8 *lsi_ptr;                    /* Local-Summary-Indicator pointer */
  19        u8 lsi_mask;                    /* Local-Summary-Indicator mask */
  20        u8 isc;                         /* Interrupt-subclass */
  21        u8 flags;
  22};
  23
  24#define AIRQ_PTR_ALLOCATED      0x01
  25
  26int register_adapter_interrupt(struct airq_struct *airq);
  27void unregister_adapter_interrupt(struct airq_struct *airq);
  28
  29/* Adapter interrupt bit vector */
  30struct airq_iv {
  31        unsigned long *vector;  /* Adapter interrupt bit vector */
  32        unsigned long *avail;   /* Allocation bit mask for the bit vector */
  33        unsigned long *bitlock; /* Lock bit mask for the bit vector */
  34        unsigned long *ptr;     /* Pointer associated with each bit */
  35        unsigned int *data;     /* 32 bit value associated with each bit */
  36        unsigned long bits;     /* Number of bits in the vector */
  37        unsigned long end;      /* Number of highest allocated bit + 1 */
  38        spinlock_t lock;        /* Lock to protect alloc & free */
  39};
  40
  41#define AIRQ_IV_ALLOC   1       /* Use an allocation bit mask */
  42#define AIRQ_IV_BITLOCK 2       /* Allocate the lock bit mask */
  43#define AIRQ_IV_PTR     4       /* Allocate the ptr array */
  44#define AIRQ_IV_DATA    8       /* Allocate the data array */
  45
  46struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
  47void airq_iv_release(struct airq_iv *iv);
  48unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
  49void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
  50unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
  51                           unsigned long end);
  52
  53static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
  54{
  55        return airq_iv_alloc(iv, 1);
  56}
  57
  58static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
  59{
  60        airq_iv_free(iv, bit, 1);
  61}
  62
  63static inline unsigned long airq_iv_end(struct airq_iv *iv)
  64{
  65        return iv->end;
  66}
  67
  68static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
  69{
  70        const unsigned long be_to_le = BITS_PER_LONG - 1;
  71        bit_spin_lock(bit ^ be_to_le, iv->bitlock);
  72}
  73
  74static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
  75{
  76        const unsigned long be_to_le = BITS_PER_LONG - 1;
  77        bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
  78}
  79
  80static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
  81                                    unsigned int data)
  82{
  83        iv->data[bit] = data;
  84}
  85
  86static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
  87                                            unsigned long bit)
  88{
  89        return iv->data[bit];
  90}
  91
  92static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
  93                                   unsigned long ptr)
  94{
  95        iv->ptr[bit] = ptr;
  96}
  97
  98static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
  99                                            unsigned long bit)
 100{
 101        return iv->ptr[bit];
 102}
 103
 104#endif /* _ASM_S390_AIRQ_H */
 105